Jig saw



g- 25, 1931- R. H. ANDERSON v 1,820,294

JIG SAW Filed Aug. 20, 1929 2 Sheets-Sheet 1 2; INVENTOR. r a @5557fiA/VQZESO/y dam ' ATTORNEY Aug. 25, 1931. R. H. ANDERSON JIG SAW FiledAug. 20, 1929 2 Sheets-Sheet 2 IIIIIIIIH V t I v l I I I\ l lira 6 I N VEN TOR. Easier fzA/vor/esm W QTTORNEY Patented Aug. 25, 1931 j UNITED-STATES! 1:031:31 n. A DE SON; OF SAN, DIEGO; CALIFORNIA," AssIGNoa orBOWMAN, or sen nrnso; camromvmonE-HAL'FT'ro .A.1.IB.-

no sAw- Application filed August 20, 1929. SeiialiNo. 387,211

My invention relates to jig saws, and the objects of'my invention are:first, to provide a jig saw which isgcapable of traveling at high speedwith little or no vibration; sec- 0nd, to'provide a jig saw whichcombines the advantages of a hand saw with those of 'a conventional jigsaw; third, toprovide a jig saw in which all movement except the desired reciprocal movement :of the saw blade is entirelyeliminatedtfourth, 'to provide a jig saw in which practically allotherparts except the blade itself are concealedyfifth, to provide a jigsaw which may use. arelatively small blade'and therefore is capable ofperforming intricate scroll work. or the like,

sixth, to provide a jig saw, the blade of which is readily removable;seventh, to'provide a jig saw in which the jerking at the ends of thesaw stroke is reduced to a minimum; eighth, to provide a'jig saw whichmay be readily operated by an inexperienced person; and ninth, toprovide on thewhole a novelly constructedjig saw which isextremelysimple of. construction proportional to its functions, durable,efiicient in its actions, and which will not readily deteriorate or getout oforder; W V q With these and other objectsin view as will appearhereinafter, my-invention C011- sists of certain novel features ofconstruction, combination and arrangement of parts and portions as willbe hereinafter described in detail and particularly set forth in theappended claims, reference-being had to-the accompanying drawings and tothe characters of reference thereon which form a part of thisapplication, in which: g

Figure 1 is aside elevational view of my jig saw, with parts andportions brokenaway and in section to facilitate the illustration; Fig.2 is an enlarged elevational view of'one of the saw supporting members;"Fig. 3 is an enlarged fragmentary sectional view thereof through 33 ofFig. 2; Fig. 4 isa. transverse sectional view through 44 of Fig. 1 Fig.5 is a reduced top or plan view of my ig saw; 'Fig. 6 isa sectional viewthereofthrough 66 of Fig.1 with parts and portions shown in elevation tofacilitate the illustration; Fig. 7jis an enlarged,fragmentarysectiOn'aI which extends .fajbolt 5. A hand nut 54:;isadapted .to clamp against the bracket 3" and in; this face; 3 guidememberfis adapted to .fit T against this face, and ris provided withview through 77" of Fig. 1; Fig. 8 is anl other sectional view through88 of Fig. .1; and ig. ,9 is a fragmentary sectional view through 9 9 ofFig. 1:. I a 1 Similar characters of reference refer to similar partsand portions throughout the several. views of the drawings. j Fra1'ne'l,,table 2, bracket 3, hand nut-.14, stud bolt ,5, guide member 6, slidemember/7, driving wheel 8, journalpin 9, connecting L rod 10,. crank pin11, drive shaft 12, band 13, lamp 14, idler rollers 15, bushings 316,journaling screws lock nuts 18, lubricat ing members 1'9, g iiid emembereo, sliding member .21, yoke member 22, tension" screw 95 23,studscrews24, andsaw blade 25 constitutethe principal parts and portionso'f-my j g w a 7 V Aframe hollow base, portion la supported by feetportions 1?), and'aii arm portion lc'which, extends upwardlyfrom therear-end of thie bas e portion and forwardly over said, base portion, asshown best in Fig.1. At "theforward end ofthe base portionjla is an up-{15' 1 isiprovi d' ed which comprises a :39

wardly. extending portion 1d.

A short distance above the base member portiorr'la mounted a tablememes- 2. The table 2 isrotatablymounted at its rear end, i

on a'stud supp'ortedby a pedestal 16 extending -8 0 upwardly from thebaseflportio'n 1a just forward-1y of the juncturef'of the arm 10therewithi Thetable 2 is supported at its forward endby a bracket 3which extends'downwardly therefrom .andjsadrptd to be clamped againstthe rear side of the upwardly pro- .jectingportionlol. .Asfshown inFig.6,-the v bracket 3 its provided with anfarcuately extending slot 3a nearits lower margin, through hold-the table2in any desired tilted osition,asgindicated; by the dottedlinesin F1g."6.

Just forwardly of the bracket 3 the upwardly extending :portion ldiscutback untilits onefside face is isubstantially ,flush with a verticalplane bisecting the framed.

v A vertically extending channelrl f is formed a vertically extendingchannel 6a therein which complements the channel 1 and forms a polygonalshaped guide or sleeve for a sliding member 7. The sliding member 7 isadapted to reciprocate in a vertical plane within the guide thus formed,but is prevented from turning relative thereto.

J ournaled within the base portion M, between the side walls thereof, isa segmental driving wheel 8, which is so positioned that its forwardside is approximately tangent with the continuation of the axis of theslide member 7. The driving Wheel 8 is provided with a slot 8a whichextends radially intermediate the hub and rim. The one end of a journalpin 9 extends through the slot 8a and is adj ustably secured to'thedriving wheel by lock nuts which clamp the margins of the slot 8a.Rotatably connected to the journal pin 9 is a connecting rod 10. Theother end of said rod is connected to a crank pin 11 which is in turnconnected with the driving shaft 12, journaled in the under side of thebase portion 1a rearwardly of the driving wheel 8. Rotation of the driveshaft 12 causes an oscillating movement of the wheel 8.

Secured to the lower end of the slide member 7 is a band 13 whichextends part way around the wheel 8 and rearwardly therefrom within thebase member 1a and towards the rear u per portion thereof, thenforwar'd-Iy throng the arm member 10. The band 13 is'secured relative to thewheel 8 by a clamp member 14 so as to prevent creeping.

The band 13 is held away from the walls of the arm 15, and the baseportion 1a by idler rollers 15, which are suitably located within thearm 10', and also at approximately the juncture of said arm with thebase member 1a. Each idler roller 15 is provided with a bushing 16, theends of which are journaled on cone-shaped end portions 17 a ofjournaling screws 17 which are screwably mounted in the side walls ofthe arm 10, and are adapted to be locked in any desired position bymeans of lock nuts 18. Certain of the journaling screws 17 are providedwith longitudinally extending bores 17 b therethrough which connect atthe outer end of the journaling screw with a lubricating means 19, asshown best in Fig. 4.

At the extended forward end of the arm 10 there is provided an enlargedhead portion 19. The head 1g is provided at its forward lower side witha depending portion 1b, the one face of which is cut back to thevertical median line of the frame and is in vertical alinement with theupwardly extending portion 111.

The depending portion 1h is rovided with a guide member 20 which tsthereover. Centered between the guide member 20 and the dependingportion 1h, there is formed a polygonal shaped sleeve, in which isadapted to reciprocate a sliding member 21, which is in verticalalinement with the sliding member 7. The sliding member 21 is madepolygonal in cross section so as not to rotate in its guide.

The other end of the band 13 is secured to the upper end of the slidemember 21. VVithin the head portion 19, the band 13 passes over one ofthe idler pulleys 15, the forward surface of which is substantiallytangent to the median line of the slide member 21.

The idler pulley 15 mounted in the head 19 of the arm is not secureddirectly to the arm, but is supported in a yoke member 22, which issubstantially U-shaped, with the legs thereof extending downwardly alongthe sides of the head 19 in channels 17' formed therein. The journalingscrews 17 of this particular idler pulley 15 are screwably mounted inthe legs 22a of. the yoke member 22. The journaling screws extendinwardly therefronn k through slots 17c registering with the channels17' and extend into opposite sides of the bushing within said. idlerpulleys 15.

The cross portion 22b of the yolre member 22 extends across the upperside of the head 19. A screw member 23 is mounted in the cross portion220 and extends downwardly therefrom so as to engage the upper side ofthe head 1g. The screw member 23 tends to lift the idler pulley 15supported by the yoke while the band13 formed around the idler pulleytends to shift said pulley to its lowered position againsl the action ofthe screws 23. Thus, the yoke 22 and the idler pulley supported therebycomprise a tension means for the band 13.

Secured into the lower end of the sliding member 21 is a saw-supportingstud member 24, which is threaded at its upper portion 2 1a and providedwith a slit 2% extending longitudinally inward from its lower end. Theslit 24b is intersected by a slot 240 which extends inwardly anddownwardly at right angles to the slit 247), as shown best in Figs. 2and 8.

A similar saw-supporting stud 24 is secured in the upper side of thesliding member 7. Supported between these two studs is a saw blade 25,which extends through a slot 2a provided in the table 2. By releasingthe tension of the idler pulley supported by the yoke 22, the saw blade25 may be easily removed from said supporting studs 24 for replacementor the like. i

The operation of my saw is as follows: Rotation of the shaft 12 by anymeans, not shown, such as a motor, causes a reciprocal movement of thedriving wheel 8, and consequently, a reciprocating movement of the band13, the slide members 7 and 21, and the saw 25. By reason of the slidemembers 7 and 21, the saw member 25 can only reciprocate. 7

By adjusting the position of the journal pin 9 relative to the axis ofthe wh 8, the

sire to include inthe scope of my invention the'construction,combination and arrangement substantlally as set forth 1n the appendedclaims.

Having thus described-my invention, what I claim as new and desire tosecure by Letters forming a substantially horizontally disposed baseportion, pulleys mounted 'within said Patent is: g

1.. In a sawing machine'of the'class described, a frame comprising abase and'an arm extending thereover, guide means portions at theextended portion of said arm and at thecorresponding portion of saidbase, said portions having V grooves formed therein, substantiallysquareslide membersmounted in saidV grooves and V formed platesdetachably secured to said guide portions and stantially intermediatesaid channels, for shifting said yoke and therewith associated pulleyupwardly and thereby tensioning said blade. I

5. ,In a jig saw, a hollow frame provided with vertically disposedends,pulleys mounted within said frame including a pulley within eachend of said frame, a-band ex-. tendin over said pulleys Within saidframe,

a saw lade extending between the-ends of said frame and secured to theends of said band, and means for reciprocating said band.

6. In a jig saw, a hollow frame'provided with vertically disposed ends,pulleys mounted within said frame including a-pulley within each end ofsaid frame, means for shifting the position of one of said pulleys inthe end of said frame, a band extending over said pulleys withinsaid'frame, a saw blade extending between the, ends of said frame andsecured to the end of said band, and means for reciprocatingsaid band.

a In testimony whereof, I have hereunto set my hand at San Diego,California this 7th K a .1 ROBERT H. ANDERSON, 1

day of August,'1929. 1

over said slide members, idler pulleys sup- I ported by said arm'andsaidbase, a band extendingaround said idler pulleys and secured to saidslide members, a saw connecting said slide members, and. a means forcausing reciprocal movement of said band and saw.

2. In a jig saw, a substantially semi-el liptical hollow frame, the onelegthereof frame, including a pulley within each end of said frame, aband extendingover said'pulleys within said frame, a saw blade extendingbetween the ends of saidframe and secured to theendsof said band, andmeans for reciprocating said band.

3. In a'jig saw, a substantially semi-el-.

liptical hollow frame, the one leg thereof forming asubstantiallyhorizontal base, an enlarged head portion formed at the end of the otherleg and provided with a pairof oppositely disposed perpendicularchannels in the sidewalls thereof, aislot extending through saidsidewalls in said channels, a yoke slidably mounted in said channels, a

pulley positioned within said head portion,

pivot means for said pulley extending through said slots and supportedon said yoke, means for adjusting the position of said yoke, otherpulleys mounted within said frame including a pulley at the oppositeend, a band extending through said frame over said pulleys, a saw bladeconnected between means for reciprothe ends of said band and eating saidband.

4. A jig saw, as set forth in claim 3ineluding a screw through said yokebearing on the upper. side of said head portion sub-

